31321423 has 8 divisors (see below), whose sum is σ = 37352448. Its totient is φ = 25679544.

The previous prime is 31321399. The next prime is 31321427. The reversal of 31321423 is 32412313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31321423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97111 + ... + 97432.

It is an arithmetic number, because the mean of its divisors is an integer number (4669056).

Almost surely, 2^31321423 is an apocalyptic number.

31321423 is a deficient number, since it is larger than the sum of its proper divisors (6031025).

31321423 is a wasteful number, since it uses less digits than its factorization.

31321423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194573.

The product of its digits is 432, while the sum is 19.

The square root of 31321423 is about 5596.5545650873. The cubic root of 31321423 is about 315.2200461314.

Adding to 31321423 its reverse (32412313), we get a palindrome (63733736).

It can be divided in two parts, 313 and 21423, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 31321423 in words is "thirty-one million, three hundred twenty-one thousand, four hundred twenty-three".